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    SubjectRe: long stalls

    Minor correction: 3ware RAID controller.

    Russell Leighton wrote:

    >
    > I can't help, but I can echo a "me too".
    >
    > We only see it when I have 2 file I/O intensive processes...they both
    > will just stop for some few seconds, system seems idle...then
    > they just start again. RH7.3 SMP, Dual PIII, 4GB RAM, 3com RAID
    > Controller .
    >
    > Brian Tinsley wrote:
    >
    >> We have been having terrible problems with long stalls, meaning from
    >> a couple of minutes to an hour, happening when filesystem I/O load
    >> gets high. The system time as reported by vmstat or sar will increase
    >> up to 99% and as it spreads to each procesor, the system becomes
    >> completely unresponsive (except that it responds to pings just fine -
    >> interesting!). When the system finally returns to the world of the
    >> living, the only evidence that something bad has happened is the
    >> runtime for kswapd is abnormally high. I have seen this happen with
    >> the stock 2.4.17, 2.4.19, and 2.4.20 kernels on SMP PIII and PIV
    >> machines (either 4GB or 8GB RAM, all SCSI disks, dual GigE NICs).
    >> I've searched the lkml archives and google and have found several
    >> similar postings, but there is never an explanation or resolution.
    >> Any help would be *very* much appreciated! If any info from the
    >> system in question is desired, I will be glad to provide it.
    >>
    >>
    >>
    >
    >
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